Process for purifying rosin.



H. 'I'. YARYAN.

PROCESS FOR PURIFYING ROSIN.

APPMGATION FILED PBB.21,1913.

Patented Dec. 8, 1914.

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UNITED STATES PATENT OFFICE.

HOHER T. YARYAN, OF TOLEDO, OHIO, 'ASSIGNOR TO THE YARYAN NAVAL STORE COMPANY, OF TOLEDO, OHIO, AVCORPOBATION OF .01310.

Pocnss Fon PURIFYING nosIN.

Spec'ication of Letters Patent.

Patented Dec. 8, 1914.

Application filed February 24, 1913. SeriaLNo. 750,324.

To all whom it wl n.1/ concern Be it known that I, Homin T. YARYAN, l

- tion.

This invention relates to a process for purifying rosin, particularly rosin winch has been extracted-from resin'ous woods by means of solvents. l a y The object of the inventlon 1s to provide A for submitting the rosin to a final treatment stances which do not pass off in the distillaforthe purpose of freeing it from such substances as turpentine and pine oil which have remained in it after the extraction process has been completed.

In extracting rosin from resinous woods by means lof solvents, particularly hydrocarbon solvents, and distilling oft' the .solvents to secure the rosin, it is difficult to recover the rosin in the pure state free from other substances which would have a tendency to render it soft or tacky, owing to the fact that the solvent dissolves other 'sub tion process, and this invention is intended as a last step in theprocess of recovering 4 superior quality than when passed direct rosin in which such solvents are used and distilled off, as, for instance, as set forth in the patent to II. T. Yaryan No. 915,4()0.

In this process, when the solvent containing the rosin and other substances, such, for instance, as turpentine, pine oil, etc., is distilled, the rosin passes from ie still in a melted condition at a fairlyhigh temperature and passes into the apparatus herein described, which consists of a tower or column having a series of perforated trays or sieves through which the rosin is caused to fall by gravity in a finely subdivided state,

and when in this condition it is treated to a, current of air at a temperature above the melting point -of rosin, the air being caused to circulate in the opposite direction from which thel rosin is passing and thus absorb or drive off these substances, such as the heavier pine oil, which are not taken off by the distillation process, leaving the rosin free therefrom and of a harder andmore from the still into barrels o1' receiving re-A ceptacles.

In the accompanying drawings-Figure 1 is a partial vertical sectional view of an apparatus in .which this step of the` process is performed. Fig. 2 is a top plan view of the receiving perforated pan located at the top of the tower. Fig. 3 is a top plan view of one 'of the perforated trays through which the rosin passes in order to subdivide it and also to permit the passage of the air in the opposite direction.

Like parts are represented by similar characters of reference throughout the several views.

In the said drawings, l represents the tower' or colulnn proper; 2 is a trough or spout by which the rosin is fed to the upper part, 3, of the tower from the still, where it falls into the upper pan, Il, from whence it passes through the orifices, 5, in the bottom of said pan onto the first of a series of trays, 6. Each of these trays 6 is formed preferably of a frame covered with screen wire of a suitable fine mesh tov permit the air and rosinto pass in opposite directions therethrough until thc rosin reaches the lower part, 7, of the tower, from which it passes through the pipe, 8, into a suitable receiving receptacle (not shown). The chamber, 7, has an opening, 9, in the side thereof which communicates with a heating chamber, 10, in which is located a steam coil, l1, connected to any `suitable source of steam supply to maintain it at a tempera ture above the melting point of rosin. At the opposite side ol" this chamber l() is a blower, ,12, of any suitable construction, which forces the air through the chamber l0 and around the 'steam coil and into the chamber 7 at the lower part of the coil, where it is caused to circulate upwardly through the perforated trays in the opposite which are thus carried off can be condensed and such substances that they contain of velue, suoh es oii or the heavier turpeh-V i time, may he the eireuiotioii or air through the to'vver muy reoovered. it is evident that Veriiug rosih romresmous Woods hy solvents' the subjecting oi3 the rosiu While hot to .the action oto current oi oir. at adhove the meitihg point rosiro is iu :i oeiy subdivided state 2. bis ,e iiuoi step 'iii'recoveriug resin, the process oic @abusing therosih While hot to How through u series of soreehsto neiy subdivide it, oud suhjeetihg the iueiy suhdivided. rosiii to e otureht oic air et a tema, temperature' of rosm While the: l

:woohoo pereture ohove the melting point of seid rosih. 4

BIAS a final step processfof admitting the rosi'iu while hot at the top of a, receptacle, causing said rosin to foil hy gravity'throl'ghv o; 'series 'of screens in saidreceptale'to imely subdivide it, and subjecting the nely subdivided rosin to the action oa. current of oir at et .tempera- Atureahove the melting point of said rosin entering the hottoinv of `said reeeptcle and eseapiugojt the top.. y

u testimony whereof, ii have hereunto set my hand this 30th day of January 1913.

' HOMME; T.. YARYAN; Witnesses: i

H. S. YARYAN,

. IML-S.- Groves.

ih 'recovering resin, the 

